Your sheet reference is in the wrong place. When you are refering to a sheet
from a userform or another sheet you must put the sheet reference with the
lowest level, in this case the Cells property not the Range property.

Your modified code is below:

If cmbSELECT.Value = "HC" Then
Range(Sheets("HCDATA").Cells(2, 1), Sheets("HCDATA").Cells(84, 1)).Copy _
Destination:=Worksheets("REGRESSION").Range(Cells( 9, 2), Cells(91, 2))
ElseIf cmbSELECT.Value = "LC" Then
Range(Sheets("LCDATA").Cells(2, 1), Sheets("LCDATA").Cells(84, 1)).Copy _
Destination:=Worksheets("REGRESSION").Range(Cells( 9, 2), Cells(91, 2))
End If


"Steve" wrote:

I receive an error code of '1004' when I use the following code:

Public Sub cmbSelect_Click()
If cmbSelect.Value = "HC" Then
Worksheets("HCDATA").Range(Cells(2, 1), Cells(84, 1)).Copy
Destination:=Worksheets("REGRESSION").Range(Cells( 9, 2), Cells(91, 2))
ElseIf cmbSelect.Value = "LC" Then
Worksheets("LCDATA").Range(Cells(2, 1), Cells(84, 1)).Copy
Destination:=Worksheets("REGRESSION").Range(Cells( 9, 2), Cells(91, 2))
End If
End Sub

I believe its caused by the fact that I cannot get focus on the sheet I want
to copy from when using the combobox. Is there any way around this?